Commit e8fc907d authored by Mike Belopuhov's avatar Mike Belopuhov
Browse files

Expose EC_GROUP_get_cofactor as EcGroup::cofactor

parent ccb2fd49

openssl-sys/src/ec.rs

+6 −0
Original line number Diff line number Diff line
@@ -30,6 +30,12 @@ extern "C" { 
        ctx: *mut BN_CTX,

    ) -> c_int;



    pub fn EC_GROUP_get_cofactor(

        group: *const EC_GROUP,

        cofactor: *mut BIGNUM,

        ctx: *mut BN_CTX,

    ) -> c_int;



    pub fn EC_GROUP_get0_generator(group: *const EC_GROUP) -> *const EC_POINT;



    pub fn EC_GROUP_get_curve_name(group: *const EC_GROUP) -> c_int;

openssl/src/ec.rs

+31 −1
Original line number Diff line number Diff line
@@ -199,6 +199,26 @@ impl EcGroupRef { 
        }

    }



    /// Places the cofactor of the group in the provided `BigNum`.

    ///

    /// OpenSSL documentation at [`EC_GROUP_get_cofactor`]

    ///

    /// [`EC_GROUP_get_cofactor`]: https://www.openssl.org/docs/man1.1.0/crypto/EC_GROUP_get_cofactor.html

    pub fn cofactor(

        &self,

        cofactor: &mut BigNumRef,

        ctx: &mut BigNumContextRef,

    ) -> Result<(), ErrorStack> {

        unsafe {

            cvt(ffi::EC_GROUP_get_cofactor(

                self.as_ptr(),

                cofactor.as_ptr(),

                ctx.as_ptr(),

            ))

            .map(|_| ())

        }

    }



    /// Returns the degree of the curve.

    ///

    /// OpenSSL documentation at [`EC_GROUP_get_degree`]
@@ -328,7 +348,7 @@ impl EcPointRef { 
        }

    }



    /// Computes `generator * n`, storing the result ing `self`.

    /// Computes `generator * n`, storing the result in `self`.

    pub fn mul_generator(

        &mut self,

        group: &EcGroupRef,
@@ -863,6 +883,16 @@ mod test { 
        EcKey::generate(&group).unwrap();

    }



    #[test]

    fn cofactor() {

        let group = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();

        let mut ctx = BigNumContext::new().unwrap();

	let mut cofactor = BigNum::new().unwrap();

        group.cofactor(&mut cofactor, &mut ctx).unwrap();

        let one = BigNum::from_u32(1).unwrap();

        assert_eq!(cofactor, one);

    }



    #[test]

    fn dup() {

        let group = EcGroup::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();